Insulator-suspension bracket.



AND NSULMUHS. UIUOIO IIUIUIUHUU Sew-eh Ream 160 C. L. PEIRCE, In..vsuumn SUSPENSIONBRAQKET.

APPLICATION FILED IAY 1]" Hi5.

Patented Jan. 2, 1917.

- [nvenor QM 86%;

M fifty UNITED STATES PATENT OFFICE.

CHARLES L. PEIRCE, J'B., OF PITTSBURGH, PENNSYLVANIA, ASSIGNOB OIONE-HALF a T0 HUBBARD & 00., OF PITTSBURGH, PENNSYLVANIA, A. CORPORATIONOF PENN- SYLVANIA.

m'SULATOB-SUSIENSION BRACKET.

Specification 0! Letters Patent.

Patented Jan. 2, 1917.

Application filed Kay 17, 1918. Serial No. 98,088.

To all whom it may concern:

Be it known that I, CHARLES L. Pnmcn, Jr., a citizen of the UnitedStates, and a resident of Pittsbur h, in the county of Allegheny andState a? vented certain new and useful Improvements inInsulator-Suspension Brackets, of which the following is aspecification.

My invention relates to improved insulator supporting brackets adaptedto be suspended from a messenger cable to support electrical circuitssecured to the insulators.

Under some conditions it is impossible to set poles for the support ofinsulators for carrying transmission lines, as for example, across abody of water. Take for example the case of tele hone lines, the spansare ordinarily one hundred feetlong. Under some conditions a littleheavier wire can be used to span greater distances but where the span isvery long the wire, usually copper, would have to be of very heavy gagein order to be self-supporting and this would of course be expensiveconstruction.

The object of my invention is therefor to provide brackets provided withclamping means adapting them to be clamped to messenger wires suspendedacross the long distance between two poles or towers, these bracketsbeing in practice suspended the ordinary span distance apart andprovided with insulators on which the transmission circuit of ordinarygage wire is strung. This is a cheaper, more e licient, and moresatisfactory construction than where the gage of the transmission wiresis increased sutli- -ciently to make the wires self-supporting.

The bracket of m invention is constructed preferably of s eet metaldimensioned and formed to give manimum strength with minimum meta On theaccompanying drawing the features of my invention are illustrated.

In these drawings Figure 1 is a side elevational view of a bracket clamd to a messenger wire. Fig. 2., is a rear e evational view thereof, Fig.3 is a sectional view on plane 33, Fig. 1, and Fig. 4 shows the mannerof forming the bracket from a length of T-bar.

, The bracket structure comprises essentially a bracket member B and aclamp member C. The clamp member shown comprises the two jaw plates 5and 6 through which extend the clamping bolts 7 and 8 to Pennsylvania.have in-- securely draw the jaws together to clamp a messenger wire 9.Secured to the sides of the aw plates and depending therefrom are thehanger links 10 and 11 between which the upper end of the bracket memberB is secure as by means of a bolt 12 held in place b a cotter pin 13.Although any form 0 bracket member may be used the one shown has beenfound to be particularly elfiClEDL. As shown in Fig. 4, it is made froma length of T-bar whose web sections a and b are first cut away'to leavethe section 0. The bar is then bent to substantially L-shape with itsback 14 curved and its u per and lower ends 15 and 16 respectivelyvertical and horizontal. After bending of the bar to form the bracketthe web section 0 forms a. stren henin rib along the center of the backan this ri terminates short of the ends 15 and 16. The end 15 is held onthe bolt 1:2 between the links 10 and 11 of the clamp, and the flathoriz pntal end 16 forms a seat for an insulator pm'17, the pin shownbeing of metal provided. with the threaded shank 18 extending throughthe '80 seat 16 and secured b nut 19, the upper end 4 of the pin havin at imble-20 for receiving a an insulator. he shape of the bracketstructure is such that when itis suspended in service from the cable 9it will hang to hold its pin vertical. The web a is widest atsubstantially the center of the back where the greatest strain occursand gradually reduces in width to the ends 15 and 16, the strength beinthus equally distributed without waste 0? material and withoutoverweight.

In practice the cable 9 is strun between two poles and the bracketssuspended therefrom at ordinary span distances apart and the line wireof ordinary age is then secured to the insulators. e cable then takes upthe entire strain and the transmis-. sion line is not subjected to anymore strain than if it were strung in the ordinary man 104} nor on polesthe ordinary distance apart.

I do not of course desire to be limited to the exact construction shownas modifications are no doubt possible which would still come within thescope of the invention. I05

I claim as follows: 1. A suspension bracket structure consisting of. aone-piece bracket member comprising a horizontal part and a bend partanda diagonally extending vertical part, an insulator receiving pinsupported in vertical position on the horizontal part, a fitting securedto the upper end of the vertical part for bangin the structure from asupport. and a rein n'cing web along the bend and vertical parts. r

2. A suspension bracket comprrsmg a clamp for engaging a suspensionwire. an L- shaped bracket member of T-shaped crossscction suspendedfrom sald clamp, and an insulator receiving pin supported on thehorizontal limb of said bracket member.

3. An L-shaped bracket formed by bend-' ing a length -of T-bar with itsweb extending outwardly, an insulator receiving pin mounted on thehorizontal limb of said bracket, and means secured to the ends of thevertical limb for suspending said bracket on a support.

at. An nsula tor supporting bracket formed by diagonally cutting awaythe web from a length of T-bar and then bending such bar to L-shape, theremaining web section forming a strengthening rib at the bend of the-formed bracket. an insulator receiving pin mounted on the horizontallimb of said bracket, and means secured to the upper end of the bracketfor securing it to a, sup ort.

5. Aninsulator supporting bracket ormed by diagonally cutting away theweb from a length of T-bar and then bending such bar to L-shape, theremaining web section forming a strengthening rib at the bend of theCHARLES L. PEIRCE, JR.

